Holder for a filter for an aquarium



FIG. 1 is a front perspective view of a holder for a filter for an aquarium showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof, the bottom view thereof being identical to the top view;

FIG. 5 is a left side view thereof, the right side view thereof being identical to the left side view; and,

FIG. 6 is a rear perspective view thereof.

The logo shown in broken lines in the Figures is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a holder for a filter for an aquarium, as shown and described. 